20. • An object has the MOST kinetic energy when
it’s movement is the GREATEST.
• When an object has the LEAST potential
energy, it has the MOST kinetic energy.
21. SAMPLE PROBLEMS
1. Calculate the kinetic energy of a 1000-kg car
traveling at 60km/h?
2. If a 0.2-kg ball is thrown with a velocity of
6m/s, what is its KE?
3. What is the potential energy of a 0.3-kg ball
lifted to a height of 5.0 m above the ground?
4. A 1.5-kg book on top a shelf has a PE of 29.4
J. How high is the shelf?
22. A water bottle is knocked off a desk.
When does the bottle have the MOST
A. At the top of the fall.
B. In the middle of the fall.
C. At the bottom of the fall.
23. • C. At the bottom of the fall.
• It has the most kinetic energy when its movement
and speed are greatest, which is at the bottom of the
fall right before it hits the ground.
• When an object has the LEAST potential energy is
when it has the MOST kinetic energy.
24. Roller Coasters
• When does the train on
this roller coaster have
the MOST potential
• AT THE VERY TOP!
• The HIGHER the train is lifted
by the motor, the MORE
potential energy is produced.
• At the top of the hill the train
has a huge amount of potential
energy, but it has very little
25. • As the train accelerates down the hill the
potential energy is converted into kinetic
• There is very little
potential energy at
the bottom of the hill,
but there is a great
amount of kinetic
26. • When does the train
on this roller coaster
have the MOST
(When is it moving the fastest?)
(When does it have the LEAST
• At the bottom of the
29. • All energy is divided into two types: potential and
• Potential Energy: The energy stored in an object.
• Kinetic Energy: The energy of a moving object.
• Energy is never created or destroyed. It is always
stored or transferred.